1) A farmer wants to transport about 1000 kg of beef from his farm to a nearby city. Which of the following is the most suitable method for his business? a) b) c) d) 2) A drop of water is placed on a slice of bread. Which organisms will be found on the slide after two weeks? a) b) c) d) 3) Lily left four slices of bread in four different places. After six days, she collects them and finds that one of them is as shown. In which condition would a slice of bread become mouldy the fastest? a) The bread was sprinkled with a sugar solution and then placed on the kitchen table. b) The bread was sprinkled with lemon juice and then placed in the refrigerator. c) The bread was sprinkled with water and then left in the kitchen in a vacuumed plastic bag. d) The bread slice was toasted until it is brown and then left in the kitchen in a vacuumed plastic bag. 4) A box of fresh fish was packed with ice before it was sent to the market. What will happen if the box is left in the Sun and all the ice melts?   a) The fish turn yellow due to fungal growth. b) The fish become soft and smelly. c) The fish remain fresh in the melted ice. d) The colour and smell change also occur. 5) James notices that fresh milk will quickly go bad once the bottle is open. Why? a) The microorganisms in the milk got enough air and became active. b) The milk sugar will change to acid if it is exposed to air. c) The milk has very little nutritional value and it spoils easily. d) The microorganisms in the air will enter the bottle. 6) Anne makes some sandwiches in the morning. She wants to keep them fresh for the afternoon tea the next day. Which is the best way to do it? a) Keep in the refrigerator b) Keep in the store c) Keep in the bag d) Leave it on the table 7) In fishing boats, the fish caught are kept on ice or in the refrigerators before they are sold. Which reason explains the practice? a) To stop the fish from changing colour. b) To prevent the fish from becoming dry and tough. c) To reduce the smell of the fish. d) To keep the fish fresh because microorganisms are not active in very low temperatures. 8) ody placed a slice of bread on a glass plate and sprinkled it with some water. After one week, Jody found that there were moulds growing on the bread but the glass plate remains clean. Which explains the observation? a) Moulds cannot breathe on the glass plate. b) Moulds cannot grow on hard surfaces. c) Mould spores from the air falls only on the slice of bread. d) The glass does not provide nutrients for the moulds to grow. 9) Sarah bought a pack chestnuts and only opens it two weeks later. She finds that they are still fresh. What do you think is the reason? a) Microorganisms died when the chestnuts are packed. b) Microorganisms cannot grow without air. c) There were no microorganisms in the package. d) Microorganisms cannot grow on chestnuts. 10) Anne packed a sandwich with a dry plastic wrapper in the morning, as shown in the image. In the evening, she found that the sandwich has spoiled. Which does not explain why the sandwich has spoiled?  a) Microorganisms can grow on the bread because the sandwich is moist. b) There is plenty of air for microorganisms to breathe and grow. c) The bread used to make the sandwich has expired. d) Moulds can grow on the bread because the plastic wrapper is transparent.

What Makes Microorganisms Grow Faster (Year 6)

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